You can see it's location marked red on the image below:
What do I mean by "interesting nature"_ Well, this invisible barrier acts like a trap, allowing you to pass it in one direction, and making a way back impossible, you will have to use fuel to fly over the small barrier, or come around the nasty thing if you will be still alive:
This reminds of invisible stairs, or elevated place, where to jump of it you just need to press "w" to walk forward, yet to get back you have to jump:
A fix would be really appreciated!
PS
I can only imagine how many snipers died there... Such a great spot spoiled by such an unfair issue.
PPS
Invisible wall tested an all game modes of this map - present on every mode.
Edited by V_ExorcisT, March 24 2014 - 04:09 PM.